For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people.
Genuine GM parts have one of these marks:

Vehicle Care
California Proposition 65 WarningRear Vision Camera (RVC)
This vehicle may have the RVC system. Read this entire section before using it.
The RVC system can assist the driver when backing up by displaying a view of
the area behind the vehicle.
WARNING
The RVC system does not display children, pedestrians, bicyclists, animals,
or any other object loc ...
Danger, Warnings, and Cautions
Warning messages found on vehicle labels and in this manual describe hazards
and what to do to avoid or reduce them.
Danger indicates a hazard with a high level of risk which will result in serious
injury or death.
Warning or Caution indicates a hazard that could result in injury or death.
WA ...
Interior Trim and Paneling
Specifications
Front Side Door Window Switch Bezel Replacement
Preliminary Procedure
Remove the front side door trim. Refer to Front Side Door Trim Replacement.
Front Side Door Window Switch Bezel Screw (Qty: 8)
Caution: Refer to Fastener Caution in the Preface section.
Tighten
...